1 /* $NetBSD: strlcpy.c,v 1.2 2009/06/30 02:44:52 agc Exp $ */
2 /* $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $ */
3
4 /*
5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
12 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
14 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
16 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include "compat.h"
21
22 #include <sys/types.h>
23 #include <assert.h>
24 #include <string.h>
25
26
27 #if !HAVE_STRLCPY
28 /*
29 * Copy src to string dst of size siz. At most siz-1 characters
30 * will be copied. Always NUL terminates (unless siz == 0).
31 * Returns strlen(src); if retval >= siz, truncation occurred.
32 */
33 size_t
34 #ifdef _LIBC
_strlcpy(dst,src,siz)35 _strlcpy(dst, src, siz)
36 #else
37 strlcpy(dst, src, siz)
38 #endif
39 char *dst;
40 const char *src;
41 size_t siz;
42 {
43 char *d = dst;
44 const char *s = src;
45 size_t n = siz;
46
47 _DIAGASSERT(dst != NULL);
48 _DIAGASSERT(src != NULL);
49
50 /* Copy as many bytes as will fit */
51 if (n != 0 && --n != 0) {
52 do {
53 if ((*d++ = *s++) == 0)
54 break;
55 } while (--n != 0);
56 }
57
58 /* Not enough room in dst, add NUL and traverse rest of src */
59 if (n == 0) {
60 if (siz != 0)
61 *d = '\0'; /* NUL-terminate dst */
62 while (*s++)
63 ;
64 }
65
66 return(s - src - 1); /* count does not include NUL */
67 }
68 #endif
69